One JS Engine Instance: this is a computer program that executes JavaScript code. It’s what allows Node to be asynchronous and have non-blocking I/O, - despite the fact that JavaScript is single-threaded - by offloading operations to the system kernel whenever possible through callbacks, promises and async/await. One event loop: this is one of the most important aspects to understand about Node. One thread: being single-threaded means that only one set of instructions is executed at a time in a given process. One process: a process is a global object that can be accessed anywhere and has information about what’s being executed at a time. When a Node.js process is launched, it runs: The thread that called setTimeout() has terminated.To understand Workers, first, it’s necessary to understand how Node.js is structured. One important case to note is that the function or code snippet cannot be executed until The timeout can also fire later than expected if the page (or the OS/browser) is busy with other tasks. The throttling minimum delay is 10,000 ms, or 10 seconds, which comes into effect 30 seconds after a When running in the foreground, the throttling minimum delay is still 4ms. Firefox does not throttle inactive tabs if the tab contains an AudioContext.įirefox enforces additional throttling for scripts that it recognizes as tracking scripts.Firefox for Android has a minimum timeout of 15 minutes for inactive tabs and may unload them entirely.Firefox Desktop and Chrome both have a minimum timeout of 1 second for inactive tabs.The specifics of this are browser-dependent: It may also be waived if a page is playing sound To reduce the load (and associated battery usage) from background tabs, browsers will enforceĪ minimum timeout delay in inactive tabs. log ( "this is the first message" ) }, 5000 ) setTimeout ( ( ) => Timeouts in inactive tabs param1, …, paramN OptionalĪdditional arguments which are passed through to the function specified byĬonsole.
Note that in either case, the actual delay may be longer than intended see Reasons for delays longer than specified below.Īlso note that if the value isn't a number, implicit type coercion is silently done on the value to convert it to a number - which can lead to unexpected and surprising results see Non-number delay values are silently coerced into numbers for an example. Is used, meaning execute "immediately", or more accurately, the next event cycle. If this parameter is omitted, a value of 0 The specified function or code is executed.
The time, in milliseconds that the timer should wait before Recommended for the same reasons that make using Which is compiled and executed when the timer expires. codeĪn alternative syntax that allows you to include a string instead of a function, A function to be executed after the timer expires.
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